<?php
/**
 * 分页类。
 * @see http://document.thinkphp.cn/manual_3_2.html#data_page
 */

namespace winer;

use common\YCore;
use common\YUrl;
class Paginator {
    public $firstRow; // 起始行数
    public $listRows; // 列表每页显示行数
    public $parameter; // 分页跳转时要带的参数
    public $totalRows; // 总行数
    public $totalPages; // 分页总页面数
    public $rollPage = 11; // 分页栏每页显示的页数
    public $lastSuffix = true; // 最后一页是否显示总页数
    
    private $p = ''; // 分页参数名
    private $url = ''; // 当前链接URL
    private $nowPage = 1;
    
    // 分页显示定制
    private $config = array(
            'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>','prev' => '<<','next' => '>>','first' => '1...',
            'last' => '...%TOTAL_PAGE%','theme' => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%' 
    );
    
    /**
     * 构造函数
     * 
     * @param array $totalRows 总的记录数
     * @param array $listRows 每页显示记录数
     * @param array $parameter 分页跳转的参数
     */
    public function __construct($totalRows, $listRows = 20, $parameter = array()) {
        /* 基础设置 */
        $this->p = YCore::appconfig('pager');
        $this->totalRows = $totalRows; // 设置总记录数
        $this->listRows = $listRows; // 设置每页显示行数
        $this->parameter = empty($parameter) ? $_GET : $parameter;
        $this->nowPage = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
        $this->nowPage = $this->nowPage > 0 ? $this->nowPage : 1;
        $this->firstRow = $this->listRows * ($this->nowPage - 1);
    }
    
    /**
     * 定制分页链接设置
     * 
     * @param string $name 设置名称
     * @param string $value 设置值
     */
    public function setConfig($name, $value) {
        if (isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }
    
    /**
     * 生成链接URL
     * 
     * @param integer $page 页码
     * @return string
     */
    private function url($page) {
        return str_replace(urlencode('[PAGE]'), $page, $this->url);
    }
    
    /**
     * 商家中心统一分页样式HTML。
     * 
     * @return string
     */
    public function shopPageShow() {
        if (0 == $this->totalRows) {
            return '';
        }
        /* 生成URL */
        $this->parameter[$this->p] = '[PAGE]';
        $this->url = YUrl::getCurrentTrimPageUrl($this->parameter);
        /* 计算分页信息 */
        $this->totalPages = ceil($this->totalRows / $this->listRows); // 总页数
        if (! empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }
        
        /* 计算分页零时变量 */
        $now_cool_page = $this->rollPage / 2;
        $now_cool_page_ceil = ceil($now_cool_page);
        $this->lastSuffix && $this->config['last'] = $this->totalPages;
        
        // 上一页
        $up_row = $this->nowPage - 1;
        $up_page = $up_row > 0 ? '<a class="prev page" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a>' : "<span class=\"page\">{$this->config['prev']}</span>";
    
    // 下一页
    $down_row = $this->nowPage + 1;
    $down_page = ($down_row <= $this->totalPages) ? '<a class="next page" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a>' : "<span class=\"page\">{$this->config['next']}</span>";

// 第一页
$the_first = '';
if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
    $the_first = '<a class="first page" href="' . $this->url(1) . '">' . $this->config['first'] . '</a>';
}

// 最后一页
$the_end = '';
if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
    $the_end = '<a class="end page" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a>';
}

// 数字连接
$link_page = "";
for($i = 1; $i <= $this->rollPage; $i ++) {
    if (($this->nowPage - $now_cool_page) <= 0) {
        $page = $i;
    } elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
        $page = $this->totalPages - $this->rollPage + $i;
    } else {
        $page = $this->nowPage - $now_cool_page_ceil + $i;
    }
    if ($page > 0 && $page != $this->nowPage) {
        
        if ($page <= $this->totalPages) {
            $link_page .= '<a class="page" href="' . $this->url($page) . '">' . $page . '</a>';
        } else {
            break;
        }
    } else {
        if ($page > 0 && $this->totalPages != 1) {
            $link_page .= '<span class="current page">' . $page . '</span>';
        }
    }
}

// 替换分页内容
$page_str = str_replace([
        '%HEADER%','%NOW_PAGE%','%UP_PAGE%','%DOWN_PAGE%','%FIRST%','%LINK_PAGE%','%END%','%TOTAL_ROW%','%TOTAL_PAGE%' 
], [
        $this->config['header'],$this->nowPage,$up_page,$down_page,$the_first,$link_page,$the_end,$this->totalRows,
        $this->totalPages 
], $this->config['theme']);
return "<div>{$page_str}</div>";
}

/**
 * 组装分页链接
 * 
 * @return string
 */
public function backendPageShow() {
if (0 == $this->totalRows) {
    return '';
}

/* 生成URL */
$this->parameter[$this->p] = '[PAGE]';
$this->url = YUrl::getCurrentTrimPageUrl($this->parameter);
/* 计算分页信息 */
$this->totalPages = ceil($this->totalRows / $this->listRows); // 总页数
if (! empty($this->totalPages) && $this->nowPage > $this->totalPages) {
    $this->nowPage = $this->totalPages;
}

/* 计算分页零时变量 */
$now_cool_page = $this->rollPage / 2;
$now_cool_page_ceil = ceil($now_cool_page);
$this->lastSuffix && $this->config['last'] = $this->totalPages;

// 上一页
$up_row = $this->nowPage - 1;
$up_page = $up_row > 0 ? '<a class="prev" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a>' : "<span>{$this->config['prev']}</span>";

// 下一页
$down_row = $this->nowPage + 1;
$down_page = ($down_row <= $this->totalPages) ? '<a class="next" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a>' : "<span>{$this->config['next']}</span>";

// 第一页
$the_first = '';
if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
$the_first = '<a class="first" href="' . $this->url(1) . '">' . $this->config['first'] . '</a>';
}

// 最后一页
$the_end = '';
if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
$the_end = '<a class="end" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a>';
}

// 数字连接
$link_page = "";
for($i = 1; $i <= $this->rollPage; $i ++) {
if (($this->nowPage - $now_cool_page) <= 0) {
    $page = $i;
} elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
    $page = $this->totalPages - $this->rollPage + $i;
} else {
    $page = $this->nowPage - $now_cool_page_ceil + $i;
}
if ($page > 0 && $page != $this->nowPage) {
    
    if ($page <= $this->totalPages) {
        $link_page .= '<a class="num" href="' . $this->url($page) . '">' . $page . '</a>';
    } else {
        break;
    }
} else {
    if ($page > 0 && $this->totalPages != 1) {
        $link_page .= '<span class="current">' . $page . '</span>';
    }
}
}

// 替换分页内容
$page_str = str_replace([
    '%HEADER%','%NOW_PAGE%','%UP_PAGE%','%DOWN_PAGE%','%FIRST%','%LINK_PAGE%','%END%','%TOTAL_ROW%','%TOTAL_PAGE%' 
], [
    $this->config['header'],$this->nowPage,$up_page,$down_page,$the_first,$link_page,$the_end,$this->totalRows,
    $this->totalPages 
], $this->config['theme']);
return "<div>{$page_str}</div>";
}
}